<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <script>
    let arr=[1,2,3];


    show(...arr);
    //...arr
    //1,2,3
    //show(1,2,3);

    function show(a, b, c){
      alert(a);
      alert(b);
      alert(c);
    }


    </script>
  </head>
  <body>

  </body>
</html>
